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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Issuance of common stock for cash, financing costs | $ 4,900 | $ 128 | $ 4,000

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- Definition Issuance of common stock for cash, financing costs. + References No definition available. + Details
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- References No definition available. + Details
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